Spiral flat drill

Abstract

The invention discloses a spiral flat drill which comprises a drill handle and a flat cutter arranged on the drill handle, a positioning drill is arranged on the flat cutter, the drill handle, the flat cutter and the positioning drill are integrally formed, the flat cutter comprises a cutter body integrally formed with the drill handle, at least two spiral cutting edges are arranged on the cutter body, and the spiral cutting edges are arranged on the cutter body. A spiral chip groove is formed between every two adjacent spiral cutting edges, and the positioning drill is arranged on the end face of the cutter body. According to the three-tip flat drill, the problems that in a traditional three-tip flat drill linear type chip groove structure, wood chip discharging is blocked, and the continuous discharging performance is poor can be solved, the service life can be greatly prolonged, and the use requirement of a user can be better met.

Description

Technical Field

[0001] This invention relates to the field of flat drill technology, and more particularly to a spiral flat drill. Background Technology

[0002] Flat drills are commonly used woodworking tools for drilling holes. These drills allow for easy control of hole depth, making them suitable for both shallow and through holes, and are therefore widely used with wood and similar materials. The most widely used flat drill is the three-pointed flat drill. During countersinking of wood, the resulting wood chips typically exit the countersink in a spiral pattern. Common flat drills have rectangular, straight chip-removing grooves, such as the three-flute flat drill disclosed in Chinese Utility Model Patent CN223604678U and the three-flute drill bit disclosed in Chinese Utility Model Patent CN219902778U. In these drills, chip-removing grooves are formed between several blades, and these grooves are straight. However, this chip-removing groove structure is prone to wood chip jamming and poor continuous chip removal. Over time, this chip-removing method can reduce the lifespan of the flat drill. Therefore, there is an urgent need to improve existing flat drills. Summary of the Invention

[0003] (a) Technical problems that need to be solved

[0004] To address the shortcomings of existing technologies, this invention provides a spiral flat drill that solves the problems of wood chip jamming and poor continuous discharge in the linear chip discharge groove structure of traditional three-pointed flat drills. This greatly extends the service life and better meets the user's needs.

[0005] (ii) Technical solutions to be adopted

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A spiral flat drill includes a drill shank and a flat cutter disposed on the drill shank. A positioning drill is disposed on the flat cutter. The drill shank, the flat cutter, and the positioning drill are integrally formed. The flat cutter includes a cutter body integrally formed with the drill shank. The cutter body is provided with at least two spiral cutting edges. A spiral chip removal groove is formed between adjacent spiral cutting edges. The positioning drill is disposed on the end face of the cutter body.

[0008] Preferably, the blade body is provided with three helical cutting edges, and three helical chip removal grooves are formed between adjacent helical cutting edges.

[0009] Preferably, the surface of the spiral cutting edge is coated with a layer of diamond powder.

[0010] Preferably, each of the spiral blades has an arc-shaped groove on each side.

[0011] Preferably, an upper cutting edge is provided on the outer side of the spiral blade end face, and the angle between the upper cutting edge and the spiral blade end face is 105° to 130°.

[0012] Preferably, the cutting surface of the upper blade is inclined.

[0013] Preferably, the upper cutting edge and the helical cutting edge end face are integrally formed.

[0014] Preferably, the positioning drill is located at the center of the end face of the cutter body, and the positioning drill is integrally formed on the cutter body.

[0015] Preferably, the positioning drill is a triangular pyramid or a cone with external threads.

[0016] Preferably, the positioning drill is coated with a titanium layer.

[0017] Preferably, the drill shank includes a front shank body integrally formed with the flat cutter and a rear shank body integrally formed with the front shank body. The diameter of the front shank body is larger than the diameter of the rear shank body, and the rear shank body has an annular groove near its center.

[0018] Preferably, the outer surface of the rear handle is provided with raised frosted particles, and the rear handle is a regular hexagon.

[0019] Preferably, the outer surface of the front handle is a smooth surface, and the front handle and the rear handle are connected by fixed welding.

[0020] (III) The technical effects to be achieved

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] Firstly, the flat blade of this invention includes a blade body integrally formed with the drill shank, and the blade body is provided with at least two spiral cutting edges. A spiral chip removal groove is formed between adjacent spiral cutting edges. This spiral cutting edge configuration is not only beneficial for cutting, but also, compared with the traditional straight chip removal groove, the wood chips adhere better to the spiral chip removal groove when being discharged, improving the guiding effect of the spiral chip removal groove. Furthermore, the wood chip roll is less likely to break, and the wood chips are discharged more smoothly. Secondly, the spiral chip removal groove can prevent wood chips from getting stuck, reduce the wear of the spiral cutting edge, and improve the service life of the spiral cutting edge.

[0023] Secondly, the present invention has three spiral cutting edges on the blade body, and three spiral chip removal grooves are formed between adjacent spiral cutting edges. This not only retains the advantages of simple manufacturing and low cost, but also significantly improves processing efficiency and performance.

[0024] Thirdly, each of the spiral cutting edges of the present invention is provided with an arc-shaped groove on each side, which improves the sharpness of the spiral cutting edge, is more conducive to cutting during the drilling process, and greatly improves work efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0027] Figure 3 This is a schematic diagram of an embodiment of the present invention with a triangular pyramid positioning drill bit.

[0028] Figure 4 This is a schematic diagram of an embodiment of the conical positioning drill bit with external threads of the present invention.

[0029] Figure 5 This is a schematic diagram of an overall embodiment of the conical positioning drill bit with external threads of the present invention.

[0030] In the diagram: 1, drill shank; 2, flat cutter; 3, positioning drill; 11, front shank body; 12, rear shank body; 21, cutter body; 22, spiral cutting edge; 23, spiral chip removal groove; 24, upper cutting edge; 121, annular groove; 221, arc groove. Detailed Implementation

[0031] In the description of this invention, it should be noted that when a part is referred to as being "fixed to" or "set on" another part, it can be directly or indirectly attached to that other part. When a part is referred to as being "connected to" another part, it can be directly or indirectly connected to that other part.

[0032] In the description of this invention, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or part referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0033] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two parts. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0035] Example 1: See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5A spiral flat drill includes a drill shank 1 and a flat blade 2 disposed on the drill shank 1. A positioning drill 3 is disposed on the flat blade 2. The drill shank 1, the flat blade 2, and the positioning drill 3 are integrally formed. The flat blade 2 includes a blade body 21 integrally formed with the drill shank 1. The blade body 21 is provided with at least two spiral cutting edges 22. A spiral chip removal groove 23 is formed between adjacent spiral cutting edges 22. A positioning drill 3 is disposed on the end face of the blade body 21. This configuration of the spiral cutting edges 22 is not only beneficial for cutting, but also, compared with the traditional straight chip removal groove, the chip removal groove 23 has a better fit with the spiral chip removal groove 23 when it is discharged, improving the guiding effect of the spiral chip removal groove 23. Furthermore, the chip roll is not easy to break, and the chip discharge is smoother. Secondly, the spiral chip removal groove 23 can prevent the chip from getting stuck, reduce the wear of the cutting edge of the spiral cutting edge 22, and improve the service life of the cutting edge of the spiral cutting edge 22.

[0036] Example 2: This can be explained based on Example 1, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the cutter body 21 is provided with three helical cutting edges 22, and three helical chip removal grooves 23 are formed between adjacent helical cutting edges 22. This not only retains the advantages of simple manufacturing and low cost, but also significantly improves processing efficiency and performance, including the following advantages:

[0037] Significantly improved machining efficiency—Compared to traditional double-flute flat drills, the three-flute helical design allows for a greater breakthrough in feed per revolution. For example, while maintaining the same feed per flute for similar products, the three-flute helical structure can increase the feed per revolution by 40% to 80%, thereby significantly shortening the machining cycle and improving production efficiency;

[0038] Improved chip removal and cutting stability — Traditional flat drills have difficulty removing chips due to the lack of spiral grooves. The three-blade spiral flat drill, by optimizing the blade layout and forming a dedicated spiral chip removal groove 23, can more effectively divide the cutting layer and remove chips, reduce chip clogging and friction, and make the cutting process smoother.

[0039] Wide range of applications—the three-blade spiral flat drill is suitable for machining a variety of materials such as low carbon steel, medium and high carbon steel, quenched steel, cast iron and titanium alloys. It performs particularly well in deep hole machining (diameter of 75mm or more and length-to-diameter ratio of more than 35) in industries such as wind power, automobiles and bearings, and is an ideal choice to replace traditional integral flat drills.

[0040] The surface of the spiral blade 22 is coated with a diamond powder layer. During operation, the diamond powder layer on the spiral blade 22 greatly increases the structural strength of the spiral blade 22, improves its impact resistance, makes it less prone to deformation and breakage, and extends its service life.

[0041] Among them, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, each spiral cutting edge 22 has an arc-shaped groove 221 on each side, which improves the sharpness of the spiral cutting edge 22 and is more conducive to cutting during the drilling process.

[0042] Example 3: This can be described based on Example 1 or Example 2, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an upper cutting edge 24 is provided on the outer side of the end face of the spiral cutting edge 22. The angle between the upper cutting edge 23 and the end face of the spiral cutting edge 22 is 105° to 130°. While maintaining a reasonable design and simple structure, this design maximizes drilling and cutting efficiency, better meeting users' requirements for improved drilling efficiency. Furthermore, the cutting surface of the upper cutting edge 23 is inclined, which further facilitates cutting and meets user needs. To elaborate further, the upper cutting edge 23 and the end face of the spiral cutting edge 22 are integrally formed, greatly increasing the connection strength between them and making them less prone to breakage during use.

[0043] Example 4: This can be described based on Example 1, Example 2, or Example 3, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the positioning drill 3 is located at the center of the end face of the cutter body 21. This facilitates better positioning, and the positioning drill 3 is integrally formed within the cutter body 21, which helps reduce damage and greatly extends its service life. Furthermore, the positioning drill 3 is a triangular pyramid or a cone with external threads. This not only offers a variety of types and a wider selection but also facilitates rapid positioning and shallow hole cutting. Even further, the positioning drill 3 is coated with a titanium layer, which increases the surface strength of the positioning drill 3, making it wear-resistant and extending its service life. This invention, through the positioning drill 3, facilitates rapid positioning, improves guiding accuracy, avoids tool deviation during machining, and ensures the straightness and surface quality of the hole (providing good positioning accuracy and reducing offset).

[0044] Example 5: This can be described based on Example 1, Example 2, Example 3, or Example 4, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the drill shank 1 includes a front shank body 11 integrally formed with the flat cutter 2 and a rear shank body 12 integrally formed with the front shank body 11. The diameter of the front shank body 11 is larger than the diameter of the rear shank body 12. The rear shank body 12 has an annular groove 121 near its center. The annular groove 121 ensures that the maximum shear force on the rear shank body 12 at this location is less than the maximum shear force at other locations. Therefore, if breakage occurs during processing, the breakage will occur at the annular groove 121, allowing the rear shank body 12 to remain exposed on the workpiece surface for easy removal without damaging the workpiece. Furthermore, the outer surface of the rear shank body 12 is provided with raised abrasive particles, and the rear shank body 12 is a regular hexagon. The hexagonal shape of the rear shank body 12 and the material of the abrasive particles prevent the drill shank 1 from rotating relative to the drill when connected, resulting in good fixation. To further explain, the outer surface of the front handle 11 is smooth, and the front handle 11 and the rear handle 12 are connected by fixed welding. The welding points correspond to each other, which increases the connection between the front handle 11 and the rear handle 12. The fixed welding structure increases the connection strength between the front handle 11 and the rear handle 12, making the front handle 11 and the rear handle 12 less prone to breakage during use, and making them more stable during operation.

[0045] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this invention, or equivalent structural or procedural transformations made using the description and drawings of this invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this invention.

Claims

1. A spiral flat drill, comprising a drill shank (1) and a flat cutter (2) disposed on the drill shank (1), wherein a positioning drill (3) is disposed on the flat cutter (2), and the drill shank (1), the flat cutter (2) and the positioning drill (3) are integrally formed, characterized in that: The flat cutter (2) includes a cutter body (21) integrally formed with the drill shank (1), the cutter body (21) is provided with at least two spiral cutting edges (22), a spiral chip removal groove (23) is formed between adjacent spiral cutting edges (22), and the positioning drill (3) is provided on the end face of the cutter body (21).

2. The spiral flat drill as described in claim 1, characterized in that: The blade body (21) is provided with three spiral blades (22), and three spiral chip removal grooves (23) are formed between adjacent spiral blades (22).

3. The spiral flat drill as described in claim 2, characterized in that: The surface of the spiral blade (22) is coated with a layer of diamond powder.

4. The spiral flat drill as described in claim 1, 2, or 3, characterized in that: Each of the spiral blades (22) has an arcuate groove (221) on each side.

5. The spiral flat drill as described in claim 1, 2, or 3, characterized in that: An upper blade (24) is provided on the outer side of the end face of the spiral blade (22), and the angle between the upper blade (23) and the end face of the spiral blade (22) is 105° to 130°.

6. The spiral flat drill as described in claim 5, characterized in that: The cutting surface of the upper blade (23) is inclined.

7. The spiral flat drill as described in claim 5, characterized in that: The upper blade (23) and the spiral blade (22) are integrally formed.

8. The spiral flat drill as described in claim 1, 2, 3, 6, or 7, characterized in that: The positioning drill (3) is located at the center of the end face of the cutter body (21), and the positioning drill (3) is integrally formed on the cutter body (21).

9. The spiral flat drill as described in claim 8, characterized in that: The positioning drill (3) is a triangular pyramid or a cone with external threads.

10. The spiral flat drill as described in claim 1, 2, 3, 6, 7, or 9, characterized in that: The drill shank (1) includes a front shank body (11) integrally formed with the flat cutter (2) and a rear shank body (12) integrally formed with the front shank body (11). The diameter of the front shank body (11) is larger than the diameter of the rear shank body (12). The rear shank body (12) has an annular groove (121) near its middle part.

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